把标签放在面板里 处理面板的ClientSizeChanged事件，使 标签填充空间: Panel2_ClientSizeChanged(对象发送器，EventArgs e) ｛ label1。MaximumSize =新大小((发送方作为控件). clientsize . Size。宽度- label1。离开,10000); ｝ 将标签的自动大小设置为true 将标签“Dock”设置为“Fill”

除了第2步，其他步骤通常都在设计器窗口中完成。

If your panel is limiting the width of your label, you can set your label’s Anchor property to Left, Right and set AutoSize to true. This is conceptually similar to listening for the Panel’s SizeChanged event and updating the label’s MaximumSize to a new Size(((Control)sender).Size.Width, 0) as suggested by a previous answer. Every side listed in the Anchor property is, well, anchored to the containing Control’s respective inner side. So listing two opposite sides in Anchor effectively sets the control’s dimension. Anchoring to Left and Right sets the Control’s Width property and Anchoring to Top and Bottom would set its Height property.

这个解决方案，作为c#:

label.Anchor = AnchorStyles.Left | AnchorStyles.Right;
label.AutoSize = true;

这帮助了我的表格InpitWindow: 标签设计师:

AutoSize = true;
Achors = Top, Left, Right.

private void InputWindow_Shown(object sender, EventArgs e) {
    lbCaption.MaximumSize = new Size(this.ClientSize.Width - btOK.Width - btOK.Margin.Left - btOK.Margin.Right -
        lbCaption.Margin.Right - lbCaption.Margin.Left, 
        Screen.GetWorkingArea(this).Height / 2);
    this.Height = this.Height + (lbCaption.Height - btOK.Height - btCancel.Height);
    //Uncomment this line to prevent form height chage to values lower than initial height
    //this.MinimumSize = new Size(this.MinimumSize.Width, this.Height);
}
//Use this handler if you want your label change it size according to form clientsize.
private void InputWindow_ClientSizeChanged(object sender, EventArgs e) {
    lbCaption.MaximumSize = new Size(this.ClientSize.Width - btOK.Width - btOK.Margin.Left * 2 - btOK.Margin.Right * 2 -
        lbCaption.Margin.Right * 2 - lbCaption.Margin.Left * 2,
        Screen.GetWorkingArea(this).Height / 2);
}

我身体的全部代码

这个问题的简单答案是改变Label的DOCK属性。默认为“NONE”。

简单的回答是:关闭自动大小设置。

这里的大问题是标签不会自动改变它的高度(只改变宽度)。要做到这一点，你需要子类化标签，并包括垂直调整大小逻辑。

基本上你需要在OnPaint中做的是:

测量文本高度(Graphics.MeasureString)。 如果标签高度不等于文本的高度，则设置高度并返回。 绘制文本。

您还需要在构造函数中设置ResizeRedraw样式标志。

从MSDN，自动换行文本标签:

using System;
using System.Text;
using System.Drawing;
using System.Windows.Forms;

public class GrowLabel : Label {
    private bool mGrowing;
    public GrowLabel() {
        this.AutoSize = false;
    }
    private void resizeLabel() {
        if (mGrowing) 
            return;
        try {
            mGrowing = true;
            Size sz = new Size(this.Width, Int32.MaxValue);
            sz = TextRenderer.MeasureText(this.Text, this.Font, sz, TextFormatFlags.WordBreak);
            this.Height = sz.Height;
        }
        finally {
            mGrowing = false;
        }
    }
    protected override void OnTextChanged(EventArgs e) {
        base.OnTextChanged(e);
        resizeLabel();
    }
    protected override void OnFontChanged(EventArgs e) {
        base.OnFontChanged(e);
        resizeLabel();
    }
    protected override void OnSizeChanged(EventArgs e) {
        base.OnSizeChanged(e);
        resizeLabel();
    }
}